Enter Calculation
Formula
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| Side Length: | 10 |
|---|---|
| Number of Sides: | 8 |
| Perimeter: | 80 |
Enter length and width to instantly calculate a rectangle’s perimeter using P = 2(l + w). See the result and your inputs displayed for quick reference.
Enter the two side lengths of a kite to calculate its perimeter using P = 2(a + b). See the total distance around the shape instantly.
Enter a sphere’s radius to instantly compute its diameter (d = 2r). Fast, accurate tool for geometry tasks, homework, and quick checks.
Compute the surface area of a sphere from its radius. Enter a radius to get A = 4πr² with instant results in square units.
Calculate the perimeter of an isosceles triangle. Enter the lengths of the two equal sides (a) and the base (b) to get P = 2a + b.
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Free online countdown timer. Set hours, minutes, and seconds to count down easily. Simple, fast, and useful for work, study, or daily tasks.
Simple online counter tool. Increase, decrease, or reset numbers instantly. Set custom step values and limits with ease.
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